Improved machinery for grinding the edge of file-blanks



UNITED STATES YPATENT OFFICE.

H. E. GRANDY, OF BALLARDVALE, AND SARGENT O. MORSE, OF MEDFOBD,

MASSACHUSETTS, ASSIGNORS TO THE WHIPPLE FILE MANUFACTUR- ING COMPANY.

IMPBOVED MACHINERY FOR GPtlNDlNG THE EDGE OF FILE-BLANKS.

Specification forming part of Letters Patent No. 39,992, dated September 15, 1863.

To all whom it may concern Be it known that we, H. E. GRANDY, of Ballardvale, in the county of Essex, and SAR GENT O. MORSE, ot' Medford, in the county ot' Middlesex, both in the State of Massachusetts, have invented an Improved Machine for Grinding the Edges ot' File-Blanks, of which the following is afull, clear, and exact description, reference being had to the accompanying drawings, making part ot' this specification, in which- Figure 1 is a plan ot'our improved machine; Fig. 2, a section on the line a; .fr of Fig. 1; Fig. 3, a front view showing the gearing by which the rolls G and H are driven. 4

Our machine is designed to grind the edges of blanks for tiles or rasps after they are forged or rolled, and is constructed and operated as follows: The shaft B, which carries the grindstone C, runs in bearings upon the frame-work A, and is driven by power applied to the pulley I). E is a carriage, which rests upon the side timbers of the frame-work, upon which it may be adjusted, so as to regulate the distance between the end ot' the feed-rolls and the grindstone, being guided by the ways a and held in place by the screws b, which pass through the slots c in the carriage and enter the side timbers ofthe frame-work. The tileblank to be ground is traversed, with its edge in contact with the face ofthe grindstone, by the feed-rolls G H, which run in bearings in the transverse rails WV of the carriage E, and are connected together and with the drivingwheel I by gears, as seen in Fig. 3, so as to feed the blank through in the direction of the arrow, Fig. l. The lower rolls, H, run in fixed bearings, and the upper rolls, G, run at one end in the fixed bearings d, and at the other end in the loose boxes e, which are held in place horizontally by the pin g. The rolls G are pressed down toward the lower rolls by the springf, the pressure of which is regulated by a nut upon the screw g. The ends ot' the upper rolls nearest to the grindstone are thus free to rise and fall to accommodate any thickness ot' blank which may be passed between the rolls. The rolls being revolved in the direction of the arrows, Fig. 2, by the driving-wheel I and gears, Fig. 3, the fileblank is ti aversed across the face ot' the grindstone as required. K is a lever pivoted to the carriage ath. To this lever is pivoted at an arm, L, which is guided by means of a pin passing through the slot k. This arm carries at its outer end a roll, l, which bears against the edge of the tile-blank, and thus, as

the operator presses the lever in the direction of the arrow, Fig. 1, the edge of the blank as it passes through between the rolls is kept constantly in contact with the grindstone. The transverse rails YV are adjusted so as to bring the roll l opposite the center of the stone by means ot' the screws m and slots u, and as the grindstone is worn away the carriage is moved up to it by the screw p, which passes' through the frame-work and bears against the carriage, the screws b being loosened to permit the carriage to move.

That we claim as our invention, and desire to secure by Letters Patent, is-

The i'eedrolls G and H and the presserroll Z, opera-ted by the lever K and arm L, or their substantial equivalents, in combination with the grindstone O, constructed, arranged, and operating substantially as set forth.

H. E. GRANDY. SARGENT O. MORSE.

Witnesses P. E. TESCHEMACHEE, N. W. SrEARNs. 

